PR HP Control

PR Single or Dual Coil PWM Controller

Not recommended for new designs

Available in limited quantities.

The PR operates as an Anti-Stall/HP Limiting Controller and adjusts its outputs as a function of the input RPM. Anti-stall, or HP load limiting,

progressively de-couples the load from the motor as RPM decreases to avoid stalling the engine. This method is typically used in situations where the operator controls the engine throttle and the load changes independently. The Anti-Stall action is used to prevent a sudden increase in load from causing the engine to stall before the operator has a chance to increase the throttle or decrease the load, or to automatically adjust the load without operator intervention. User settings and adjustments to the regulation process are made via a computer through the Serial Communications System.

The PR operates as an RPM Regulator with a closed loop, single or dual coil PWM output that adjusts to cause the RPM of a device to precisely match the commanded value. The COMMAND input may be used to set the desired RPM value. Setting the MIN RPM equal to the MAX RPM will cause a fixed RPM regulation set point, but the COMMAND input may still be used to select direction of rotation. The coil current can also be set to whatever value is required to keep the RPM input at the set point value. A PID loop smoothly regulates the RPM by adding to, or subtracting from, the load on the engine, or by controlling the engine throttle. User settings and adjustments to the regulation process are made via a computer through the Serial Communications System.

Rugged Construction:

¨ Fuse protection in series with power to the unit allows inputs and outputs to be hooked up backwards, shorted to each other, grounded or hooked up to +/- 30 volts without harming the unit.

¨ Power Supply input is protected against automotive spikes.

¨ Epoxy potting provides mechanical protection and environmental resistance, including sealing potentiometers against moisture.

¨ Operating temperature range is -40°C to +75°C.

Setup and Installation:

¨ Interconnect is through an 12-position terminal strip that will accept up to 12-gauge wire.

¨ Labels located next to each of the terminal strip connections make installation easy.

¨ Minimum input response (dead band elimination), maximum input response, ramp times, dither amplitude can be adjusted via the HCT Opto3000 and setup software.

Inputs:

¨ Pulse In: input with a minimum impedance of 100K ohms. An external power supply is required for some sensors; this unit has no provision for providing sensor power.

¨ Enable In: Digital input to turn unit OFF or ON.

¨ Direction In: Digital input to select which coil to drive.

¨ Command In: Analog voltage input to be used with a 10k ohm pot, accepts 0 to 5Vdc or 0 to 10Vdc.

Power Supply:

¨ Unit can be powered from 8 to 30 Vdc or from 20 to 35 Vdc.

¨ Protected against normal automotive type spikes.

¨ Reverse polarity protected. All inputs can be connected to the power supply without damage.

¨ Operational temperature range is from -40 to +75 C.

Outputs:

¨ Single or Dual proportional outputs.

¨ Regulated 5 Vdc command pot reference voltage.

Current Capabilities:

¨ Current ranges include maximum values of 63 mA to 3.3 A.

¨ Optimized current ranges for two EDC valves in series or a single EDC valve.

Optical Interface:

An optical interface “port” located on the unit allows the valve driver to communicate to a PC’s USB port using HCT’s, "Opto3000", optical interface device. This non-corrosive port uses light for communication preventing the possibility of damage to the PC.

Indicators:

¨ PWM% LED is provided for each valve coil.

¨ Error LED flashes for any detected error.

¨ PWR OK LED indicates power levels of 8‑30 VDC.

Options:

¨ "Q" Option, Weatherpack Connectors with 6-inch leads. See Order Guide for details.

¨ "V" Option, Single-turn waterproof potentiometer with bezel marked 0 to 100. See Order Guide for details.